This time I have to agree with Jim and John. An aquarium should be a good balance of fish, invertebrates and corals. I love sea dragons, but here it would be big, flamboyant and too distracting.
This is a tank, not a reef, and the fish should to interact in harmony, not gobble each other up. That leaves room for plenty of other interesting behaviors, such as schooling, or nibbling algae from the rocks.
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